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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb95dec326d0bb04d4d137779c194690053d5f175bd78f638d94a81292e7ad82' 
  AND token = 'aS98SWmt1Ow988bWj+ymgYcgQKM+7+lpIcO/PKhP22M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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