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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76b3ff99f050526a7c1289d5a58fe0083e004406dc1c8a4ad29bf6df058dd16' 
  AND token = 'ZnGYQ37ZAt/l9WCsxOkLaSVH+061PFv+krwgaI0Yj24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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