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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002739dc4ac81f3104ca048d1f7320edc15e170933eb20349acca174a62ab34a' 
  AND token = '5vq3TyhCGcoZTe3Sh6GoaVQrs/yNVWtrn7LbpXN2kAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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