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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62447db3418533c518b3b217d156f5ba73a13330230a40c9288b6394a8e2db6d' 
  AND token = 'Ozyes279gK2rJH7rU6dLen70st/FS5GWJqiM7E2Qzyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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