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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b51e9e7b3f32a585f04497a8e2d74346571f37f79386ac2be93f6e42eb2db6' 
  AND token = 'p45h43ZOo8qdiJFtzE6HpLS44bgD31RvhZ8Fxfwl7G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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