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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2098bcb4d5e920cc81dfcaa45559a29ad7eb5c2e869dabc0b4d0747916c1a4' 
  AND token = '5Bff8AT3D6EWplG01bCoHivCw2Hbablb0jGUX2Oglng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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