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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3605f02d276c0b3451a0b7cd8a91d55a2e5762c73b4dd2694403e2be8e3254b3' 
  AND token = 'firxexWrmJFr2IHmjvz+bf2E0fzvWQWriaGKNtabbs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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