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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ffdd843c1694b45c43cce1b1b4b4911c69a33e663f24db27ec8b059bc5c3e8' 
  AND token = 'peaukJklkhMCVlQx/VNBirF39ZzWkj6Gi5dJWW1KKhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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