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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06b4b4d085bd424e9bbcad26892386d0c2ca9bbf6c2223e7ace1e38ebcd74a2' 
  AND token = 'nPfoh6Jg1jasHVfbgdbcXlRSwYUAwDbie1Pp00fDWZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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