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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaab011b11937258b8a01ec6f8a958dc5dc7734b19d111a9c6ae137fa5eb245' 
  AND token = 'NPRd/1miB3jurQi/LWUN1xpolyQFvPbQDK6kkMZ+ucg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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