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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16858500e94dc7f6ae0b6eaef6c278fe0f94a6037d28643667603be468ee11b' 
  AND token = 'ZN3OonAc8wEhiP6Q/EIKaGVrQJY1kLT4mDENZOH1A30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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