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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3628114d862ecb503bda88a266f54af6df68545dce350cca1ea498e2bd57f050' 
  AND token = 'h/VG0xP3px0KBcbx8R0KtfnsNhcQa2xMKBHf2iUnjho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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