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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31e96dbced612d76a4a96b032afc936563e05553778770f81358676ae924dfd' 
  AND token = 'O7Ouu443IFgq8kcBfDQv8Jn1gDVIAyDGndsH0yBO/oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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