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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9abef4ac8349ba10ede338339b98476d48affe5520e0449bf00714f890f8bd' 
  AND token = 'xWY2ahHIrPcnUls5VSxE+fvSiaEVCa1riH6a0qt+1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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