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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef52caaf7a2f0f303e58c79a38f14d7037c836e432ba123fb1993905656f0084' 
  AND token = 'yeNXjgDizhKFNejVQ9uFlaDEuoGuIp6JiAsha8NASz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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