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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd808fa05d76dfb7ac6110d52f28a568ff9d5e92b25f43334936d4438d49ce4a5' 
  AND token = 'VWFwjSz4oR9324Rz5h6X1pjuYgJusQ3AsXnk2Ofmay0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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