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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60818c06ff1246fc39f42f8bb13f3bb6ba9f1d3aaf9f4ea94311b545db002cb' 
  AND token = '04KvuGNK2gnRzQDfb7j9nlV/RnoN6hHDvu09CjfxE7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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