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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733c2629de1410a05979081dedc98e406dc410965bb8538533d57358b3eaf254' 
  AND token = 'cAjeJ4N4ydpitu3B8yrRdwuZa7luJ7fm1p55hfAnOCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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