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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36709aeabe0968366c8c3d05c4ff38034eb39c969d19295a398b0a8109f8adba' 
  AND token = 'OiqnjQuxfIXbUx1Jvvj7uQ+wUlQPOcCz7H3/iblqM+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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