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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a0ebca1416943b65072823bdfe70e76a7a7a8030d285eedcf4a6d04f1bf20a' 
  AND token = 'fsM07zYUHy993F549botwdfflENNnMn8BJ1pxUHRujA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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