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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e386f3bf22a3a96b0473deb23191ea386b514d73edf14662d5dfc0d8093467' 
  AND token = 'dufo3F90FvTtCY0AEikRFNpyH4aN33vrTR3pRRaeD58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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