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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a530efb301a7b482e54331ed6fe85139992b29ca9d950eb82a76aa41970525' 
  AND token = '5BQs1T8fBEG15Th3CNjjd2i53DMb8KX76aGOeux/sBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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