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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0b40fab5a5afea1e861d8a69b1a9ecbc9ca0f1a255e8c551d4eaf113463c6c' 
  AND token = 'Wz2W3OUHz7ymkJTjR64HblrU9SCTT9e5t/Jd8X95kzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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