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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aed5c0ef7fecffbea5bed76fd5e48800eb355e7cc1835942ff85cb436c5455' 
  AND token = 'O/Az8HxS8gJZNSOCwwQa2BaJjtpsW57LLAzts1i9mR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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