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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beac18b856d9c2f1bb33a6c5f4d9cd94e0dd54b2b82e2897a71c20b5e677645f' 
  AND token = 'rMHrHgBSvIbMNY2/6/tPSwMT/9hYM9N4gnOVJVTs5hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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