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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a1b84dd37ff325d06439b8e606f48b15668e404d74556fbb69beba24094198' 
  AND token = 'BXVXTxv5L6FIKMtxBulLIVZgNKuZto7tc4d7GTUBn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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