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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da59f0118faceb2ad42bc8af19b976301b38ad732c463b6bbd0581d63796baa1' 
  AND token = 'G3aa14yhn5qoRaKPZQlErmkcy9KD0PsmFtOEpU0S9bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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