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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b87445ab709e445229f4aba3322dbdf8896bbae10c212d6e1cda516c92ecd3' 
  AND token = 'In2FlXjn6qpzk7f7zST4CUbnlREdbFRe35Q1+oQuGT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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