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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be314cee48360499405b521c722c811793eea7aa17323b2c847167810cf6efd' 
  AND token = 'Y8H0v7y/8+QXBZGEW54ovXpQxvDx60TnpAZZ3IX1EYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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