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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc3363d17e4114e17df048b8ca128291ce93e86e3cd82bad80e64d19a896bb8' 
  AND token = 'YQVTRiHdLKpT5XJN9DNF1L01jrbfY8/hMw+K1t2HBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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