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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6103dc5dc006ecfbd5a9717a2f95a82ac22b7fccf7537bbc4f4cae050b7998' 
  AND token = 'ON0m+QLfaemlJNCZV/bO8ZivdC+POWmskQGnTkOv0EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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