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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3d14f92ba6d1a53ecfd7f405c17f7a9484fd67c8c817f15c73482861d7a240' 
  AND token = 'xtJOSxhaAI4Wnr2FzDukDy5+wFkPPpIw8WJGcVyFXjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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