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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71344c8ab61eed374e215ee6f11d898038bfc500e46c3a6ad51f7ac16ca5b920' 
  AND token = '3nolSAEI3PherLwWXgrbSOtX0UQ+owSwP0AZ7Y90MSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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