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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e021e00f002ed91c51ba3302bbed4b0c5f06522fc98915133872db45bfaa09' 
  AND token = 'hboj/valQkLW5xyoPnS+6gBV5e3KNr8ItYDDDO6DP9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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