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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ed14a1c1e34b19df78355baa1400d9f838423ca35c38072a39e123bd7e3000' 
  AND token = 'kGsrch+7ilntd6QX56SK6TKR2Ggyu2GhPlOHqrFam4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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