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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d71b85dd5974e89c00ebe47024ac8f12a80f6db58de4ea22869a44b7b24799' 
  AND token = '12r3uxrKgDa4JTORnfHYUfCFYqSIFKtg8QhF4tn9aB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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