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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dbef853576eab1b91cf4557555d1960085080748e5c8379361a2012ca12989' 
  AND token = 'lLsKKCPbU/VeyybenKHjQqqr7L3TPYytGfM0WLm9tlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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