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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6a4abd4146aa32424d7739cd06848fc585af1af96534cde4856fc32579bdec' 
  AND token = 'aeqeLVPr2yQWAq3gXTMuz9DCCCi6lW7YQuqyw/EPOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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