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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4ba054d226751fe6a3d0608ccb6638f0faa55d4103dadf6a13a28562dc0173' 
  AND token = 'a7csyCtCurnDy1TZaMbaX5bClhlQlhKmT0/AGDh9Coc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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