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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c355b81aaa9d6e9a4f4e0b6bc6a5232db3fec12ffe1ba99cc8eafe1ee1a90bd' 
  AND token = 'erFatD2mJkiDxzlAl8z44E1D6UXaMrSzNkxJ0DnqXmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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