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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351b3bdece224a1882e4ae2fd808af03f3b365db5ba6bb8da8162c96d4310ab1' 
  AND token = '/kz284Y/uN2Lr/DtI7ao8l4xdd7QIOUW/Z0VEIPmUhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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