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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45df7d680062c6ae8c95564d994e08fd55eda263395b52cb4233e3bd051eba6' 
  AND token = 'unZgwhwWZR6/E6R2UEQeG4b7Qz8cf5uVlZ40AqChKPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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