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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c90ad96bb5a121e60cff5f5ff939714c40821d22290e1bb6645a41b750443f6' 
  AND token = 'M0pUe0JkHl9C7YRj3dDJ5nHifk34vpJQjRwuYRtlgtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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