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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bac99e7ffb1b86eb78440c4e137699d80159484598080b91c2aeef3e70f0ca0' 
  AND token = '55A38Pj7yIjD2K4CHNy3sV9B26klGMHV6G2wWL12RdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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