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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9eb016d0f658b6e0cc0b6e4443328dc6923fd0ae870743a5073299c1d103cd7' 
  AND token = 'uy4TT/yaHm7ZsNVmXoSFtiNFBS0qo8mNcxHqbdijaHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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