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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2444b2344964c1a50110875ac99ee774bbb1b0a7970644f14c18d35cd4816494' 
  AND token = 'J1Re2gBF34aGOn45HOCNOTlhqmmHfws8TYJEWSUXeGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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