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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25fe1f9d317d0072e4a291c6f12222a94ba3c2f7f9e107809064c180205bfbc0' 
  AND token = '6DgrkGit+cyFMcOS5SCLaPH5RcTMxQUz9349adSbn7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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