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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0696267d7d6bc9819301cf722fbc6d23d9a0bbbe67d2a9dac3180762163cd7' 
  AND token = 'Zba/rsS2yRqNDjnZcMjCZ/jrrcMWa72f0H0xLH1v6UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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