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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c2432d4ea2053b626c34849da0d1f7d1f8682d96a547fb05fb426342eb33d5' 
  AND token = 'y7f7YJfel89/iPM3DzhcdVn1kEC7J3rDJSzLgGydcJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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