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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71beffdb7d251bf958ab55cc9d306bd1079ae88f954adef658a2c7c16a257b3' 
  AND token = 'HzeVxAvsG/y629eK6YYjwtNxk+4c9IMYIUNQvIdcdoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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