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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c9684001c550a8e18cb6a2a8deee1a9de49142c60830105e0c734698bd538d' 
  AND token = 'Ys3TLMCrb95M6g11hbs4Md9e45KOte9ByhV47M6Nqoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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