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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807815e731e8fe61d7e130641d8cbe10f635bfc0e6910626133c419ffd80654a' 
  AND token = 'mo/czawDmt6kAD1BM5QQr1XLv1ANAROX4/s2g3ndPq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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