SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bed435290d2fe67355318aea4e6cff39ba7bc7dfa595423b6abbcfd64d2e571' 
  AND token = 'bOmtR/Q1AY0jjHunXSqHzdaT1LvTKG8Vy0Qon1kPU4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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