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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb55cd9ffdb422db72fc7e2e3db2f6c4a65ec34a31fefd546548e708d1300d86' 
  AND token = 'jUoH5Nis0vhjV5ghw/TxOIm4zxK7YJeMdiudNVaURw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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