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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731feee14ae297a0b0ca8fd50dbb63e95a2f6bb525e5aaacc0b1babbf374620e' 
  AND token = 'GhqOT2o4MB1tzsXOSitz4Z6W0uphLAvg/eSMAv2ozeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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