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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bd858bc1a39eb648c8cc5a3a228396397b4f48ec3a210d806347ce72111a3c' 
  AND token = 'ckqedohFaw4+gzFfliEnGmK6OJQyoIOUU/SA2FNx2oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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