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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f3d7d945ca8c3b3e149c9e148ed4bc374e24ba5caf8c8dc0d789c4bdee29ea' 
  AND token = 'J9545VDq2025el2rnnR2/8oClOWSKKWMwPk8RAlfsVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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