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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda0b3a823faf28d8bb24b83c40b808ef68668fe8c8253855cc5fb8315113b53' 
  AND token = '0ZM/XOGenMfQ8FSEJ1lvc5N8LB9yoMcGyaF+xaIPO3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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