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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0a441092b6a392db8924fc845a201d8a69d60a7f6a2ed2680d7a360ee6e70a' 
  AND token = 'OEf/I7sZX3tyV3fm9U9Rkc3eB+mAuTdGwMQLwsruf6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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