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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7fbd114ffa271db27c0b8ad2704fed516bf67b5ec475ab7389aa9f0d4c84f2' 
  AND token = 'cVI0Yul/2Vh/m1Ss7qDfaBAdu3nKQ2pZLyfgI3qAt6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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