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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913636058c81e5645728dbe26e7dcf840e226106428c9fe6fa58d28cea140aaa' 
  AND token = 'PLfP4O+z8PkUPzry9D6Kw1PUyXOHSEILppptL3+u2iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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