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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ddfcbb5c76178fd2d8c95d496ac1eb85c27aaa54fd08f9a12577a07e49ee5a' 
  AND token = 'c63L2bHBibAcm/RJQbO8d3xzREFXQN/79jvNktdZjfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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