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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39d59de9beadea76f4c1cdc17b320b532f8bd7c94a646edf78071c874e1c4f0' 
  AND token = 'UfemFlCUbqQ/2C0uYdSF+7KRihkiR8iOXv96TbI2dwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}