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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc82568a422ebd5c8aa6f463df54780999908905d44a0e2185a9a840210851f2' 
  AND token = 'skiwjSBXrG5JRxkkRxrXUKLwEMI8UiyMMn4Xk4CTTBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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