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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647f19183b213c30fc5965887c6f24e42093dbcfafb8677836fcac683aa62bbd' 
  AND token = 'uniHIDD+VkvIb9CXibSVZQk8v5mMQsQ0TKObrP9KQPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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