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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a00eda3f95416b31bc2909f6fef9cb13191b8698879c598d9f87cf8d49e21ab' 
  AND token = 'blx5j8O3KfwCaomiBWgMe6gMGQI7DoG0kquWO8vXGlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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