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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ff7715a5c6ad2989b753f3e84122ab039b73c9a03f6bc96f38d3894368034d' 
  AND token = 'X8LbzxsGr0N0CGAcCibpXW171x5oPukSDeEqd952Xjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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